2004 search results for "map"

Correlation network

March 22, 2011
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Correlation network

I came up with an idea to draw correlation network to get a grasp about relationship between a list of stocks. An alternative way to show correlation matrix would be head map, which can have limitations with big matrices (>100). Unfortunately,  ggplot2 package doesn’t have a easy way to draw the networks, so I was left

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A 3D Version of R’s curve() Function

March 21, 2011
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A 3D Version of R’s curve() Function

I like exploring the behavior of functions of a single variable using the curve() function in R. One thing that seems to be missing from R’s base functions is a tool for exploring functions of two variables. I asked for examples of such a function on Twitter today and didn’t get any answers, so I

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How to display scatter plot matrices with R and lattice

How to display scatter plot matrices with R and lattice

In lattice, there is a function called splom for the display of scatter plot matrices. For large datasets, the panel.hexbinplot from the hexbin package is a better option than the default panel. As an example, let’s use some meteorological data from MAPA-SIAR: library(solaR) library(hexbin) aranjuez <- readMAPA(prov=28, est=3, start='01/01/2004', end='31/12/2010') aranjuezDF <- subset(as.data.frame(getData(aranjuez)), select=c('TempMedia', 'TempMax',

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Circular or spherical data, and density estimation

March 17, 2011
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Circular or spherical data, and density estimation

I few years ago, while I was working on kernel based density estimation on compact support distribution (like copulas) I went through a series of papers on circular distributions. By that time, I thought it was something for mathematicians working ...

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Risk-Opportunity Analysis: Houston

March 17, 2011
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Risk-Opportunity Analysis: Houston

I will be attending Ralph Vince's risk-opportunity analysis workshop in Houston this weekend.  I'll be in town Friday-Monday.  Drop me a note if you're in the area and would like to meet for coffee / drinks.

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Having a problem with R-2.12.2 64-bit and "gam’ package!

March 17, 2011
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Having a problem with R-2.12.2 64-bit and "gam’ package!

While working with some pitch location data recently, I ran across something strange when using my new computer (with R-2.12.2 64-bit) versus my work computer (with R-2.11.1 x64). Both are 64-bit computers, but I got the new one for portability (it's a laptop) and speed.Anyway, I had been doing some work in the office with Pitch F/X data,...

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Having a problem with R-2.12.2 64-bit and "gam’ package!

March 17, 2011
By
Having a problem with R-2.12.2 64-bit and "gam’ package!

While working with some pitch location data recently, I ran across something strange when using my new computer (with R-2.12.2 64-bit) versus my work computer (with R-2.11.1 x64). Both are 64-bit computers, but I got the new one for portability (it's a laptop) and speed.Anyway, I had been doing some work in the office with Pitch F/X data,...

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Visualizing Growth of a Retail Chain

March 15, 2011
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Visualizing Growth of a Retail Chain

I am a regular reader of the FlowingData blog by Nathan Yau. It is an excellent reference for anyone interested in statistical visualization of data. One of his posts that caught my attention was a visualization of the growth of Walmart in the US. Given my research interests in retail, it was a fascinating insight

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Legendary Plots

March 12, 2011
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Legendary Plots

I was recently pointed in the direction of a thermal comfort model by the engineering company Arup (p27–28 of this pdf). Figure 3 at the top of p28 caught my attention. It’s mostly a nice graph; there’s not too much junk in it. One thing that struck me was that there is an awful lot

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Review: R Graphs Cookbook by Hrishi Mittal

March 11, 2011
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Review: R Graphs Cookbook by Hrishi Mittal

Summary: Very useful for reference while producing graphs, and very comprehensive (including heat-maps, 3D graphs and maps). Reference: Mittal, H. V., 2011, R Graph Cookbook, Packt Publishing, Birmingham, UK, 272 pages,  Publisher’s Website As a scientist I often need to plot graphs of my data, so I am keen to learn more about how to

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